[SOLVED][1.13.2] NPE while getting any WorldServer

[Krevik]

Hello! I am having some problem with teleporting player/entity to a new dimension. Whenever I try to get WorldServer (for my custom dimension or for Overworld) like that (because it's required argument to teleport player/entity)
 

                    WorldServer server = worldIn.getServer().getWorld(DimensionType.OVERWORLD);
                    WorldServer server = worldIn.getServer().getWorld(someFile.cusotm_Dimension_Type);

I am getting NPE crash which points at the line I am trying to get WorldServer. Am I doing sth wrong or is it forge fault? I am using forge 0.45

Note that 
 

                    WorldServer server = player.getServer().getWorld(DimensionType.OVERWORLD);

also doesn't work.

Here's my whole teleportation code 
 

Spoiler

    public void onEntityCollision(IBlockState state, World worldIn, BlockPos pos, Entity entityIn) {
        if (!entityIn.isPassenger() && !entityIn.isBeingRidden() && entityIn.isNonBoss())
        {
            entityIn.setPortal(pos);
            if(entityIn instanceof EntityPlayerMP){
                EntityPlayerMP player = (EntityPlayerMP) entityIn;
                entityIn.timeUntilPortal=10;
                if(player.dimension==Kathairis.kath_Dim_type){

                }else if(player.dimension==DimensionType.OVERWORLD){
                    WorldServer server = player.getServer().getWorld(DimensionType.OVERWORLD);
                    player.changeDimension(DimensionType.OVERWORLD,new TeleporterKathairis(server));
                }
            }else{
                entityIn.timeUntilPortal=10;
                if(entityIn.dimension== Kathairis.kath_Dim_type){
                    entityIn.changeDimension(DimensionType.OVERWORLD,new TeleporterKathairis(entityIn.getServer().getWorld(DimensionType.OVERWORLD)));
                }else if(entityIn.dimension == DimensionType.OVERWORLD){
                    WorldServer server = worldIn.getServer().getWorld(DimensionType.OVERWORLD);
                    Validate.notNull(server, "server is null!");

                    entityIn.changeDimension(DimensionType.OVERWORLD,new TeleporterKathairis(server));
                }
            }
        }
    }

 

 

Edited February 25, 2019 by Krevik

[Krevik]

seems working after adding 

!world.isRemote

check